Frac 4 3 ( sqrt 2 - 1 ) July 8, 2019 16 32 64 128 $ frac 1 4 - 2 sqrt 3 frac 1 216 Frac 4 sqrt 3 + 5 sqrt 2 sqrt 48 + sqrt 18 Frac frac sqrt 3 2 frac 1 2 Frac 2 3 - frac 1 2 Frac 4 sqrt 2 + frac 2 sqrt 3